Pornpol Romayanukool. (1989) Manufacturing and improvement of green coffee. Mahidol University,:ม.ป.ท.Pornpol Romayanukool. 1989. Manufacturing and improvement of green coffee. ม.ป.ท.:Mahidol University,;Pornpol Romayanukool. Manufacturing and improvement of green coffee. ม.ป.ท.:Mahidol University, 1989. Print.